JPH04288489A - Brazing method of outside projecting part for heat exchanger - Google Patents

Abstract

PURPOSE:To braze an outside projected part such as a bracket or the like to the outer surface of the core of a heat exchanger easily through a plate. CONSTITUTION:A short annular projected part is formed integrally on the outer surface of a plate and holes are bored on the planes of an outside projecting part 5. The holes are fitted to annular projecting parts and the tip ends of the annular projected parts are caulked. Then, the whole of a heat exchanger is passed through a furnace having a high temperature under assembled condition to fuse a solder, applied on at least one side of the plate 4 or the outside projected part 5, and braze both parts integrally to fix them.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for brazing externally protruding parts such as heat exchanger mounting brackets protruding from the outer periphery of a heat exchanger core.

0002

[Prior Art] In many stacked heat exchangers and corrugated fin heat exchangers, after each part is assembled, it is inserted into and taken out of a high-temperature furnace, and the brazing material coated on the surface of the parts or the gaps between each part are used. The solder foil interposed between the parts was melted and solidified, and the contact parts of each part were integrally brazed and fixed. At this time, it is often necessary to protrude a bracket for attaching a heat exchanger to a strength member such as a side member or a header plate. In this case, it is necessary to temporarily fix and position the bracket and the plate on the outer periphery of the heat exchanger, and then insert it into a high-temperature furnace. Therefore, conventionally, holes were formed in the bracket and the plate so that they matched with each other, and rivets were installed in the holes and caulked to fix the two.

0003

[Problems to be Solved] However, this method of positioning and fixing the bracket and the plate has the disadvantage that it increases the number of parts and the number of man-hours, which hinders mass production. At the same time, as shown in Figure 6, the rivet 15
This causes problems such as a gap being formed between the plate 4 and the fins 2 or other elements that come into contact with the plate 4, and deformation occurring in that portion.

0004

[Means for Solving the Problems] Therefore, in order to eliminate the above problems, the present invention adopts the following configuration. In the brazing method of the present invention, a core 3 is assembled by bringing fins 2 into contact with the outer surface of an elongated hollow element 1 such as a tube through which a heat exchange medium flows, and a plate 4 is placed in contact with the end surface of the core 3. Then, an external protruding part 5 such as a bracket is placed in contact with the outer surface of the plate 4. Then, a brazing material is placed on the outer surface of at least one of the heat exchange parts that contact each other, or a brazing foil is interposed between both contact parts, and the whole is placed in a high-temperature furnace. This applies to products in which the contact parts of each part are brazed and fixed to each other by a brazing process that involves insertion and removal. Here, the feature of the present invention is to take the step of integrally forming, by burring, a tube-shaped protrusion 6 having a smaller diameter and higher pressure than the plate thickness of the part at the position of the externally protruding part 5 on the outer surface of the fin 2. Next, the hole 7 formed in the flat part of the externally protruding part 5 is fitted into the cylindrical protruding part 6, and in this state, the tip of the cylindrical protruding part 6 is caulked to attach the externally protruding part 5 to the plate 4. Take steps to support it. After that, the brazing process was performed.

[0005]

[Embodiment] Next, an embodiment of the brazing method of the present invention will be described based on the drawings. This embodiment describes a method of brazing the externally protruding part 5 provided at the upper end in FIG. 3 showing a front view of a heat exchanger and FIG. 4 showing a plan view thereof. This externally protruding component 5 is an L-shaped bracket, and is fixed to the outer surface of the plate 4 by brazing. Note that this plate 4 is fixed to the outer surface of the element 1 by brazing. FIG. 2 shows a cross section taken along the line A-A of the external protruding component 5 located at the center in FIG.
It is. Moreover, FIG. 1, FIG. 1a, and FIG. 1b are explanatory drawings of the process showing the preparation stage of this brazing method, respectively.

As shown in FIG. 1, the external protruding part 5 and the plate 4 are each clad with a brazing material 13 on one surface side. As an example, the plate 4 is formed into a curved and elongated shape by a press machine as shown in FIG. disconnected. Further, the entire external protruding part 5 is bent into an L-shape as shown in FIG. 1, and a bolt insertion hole 16 is provided on the rising surface thereof, and a pair of holes 7 are formed spaced apart from each other in the horizontal part. A pair of cylindrical protrusions 6 are integrally formed on the plate 4 so as to align with the pair of holes 7 . This cylindrical protrusion 6 is formed by burring, has an outer diameter slightly smaller than the hole 7, and has a protruding height higher than the overall thickness of the externally protruding part 5. The hole of the external projecting part 5 is fitted into the tube-shaped projecting part 6 of the plate 4 formed in this way, as shown in FIG. 1a. Next, by caulking the upper end of the cylindrical protrusion 6, a caulked part 12 is formed there, and the external protrusion part 5 and the plate 4 are brought into close contact with each other. Note that the heat exchanger in FIG. 3 includes a plurality of externally protruding parts 5. Therefore, each of the protruding parts is closely fixed to the plate 4 through the same process as described above. Incidentally, bent portions 10 are integrally formed near both ends of the plate 4, and bolt insertion holes 16 are formed therein as well. Further, openings (not shown) are formed at both ends of the plate 4, and the open ends of the joints 9 are fixed thereto by brazing.

Next, the element 1 has a curved plane in substantially the same manner as the plate 4, and has a flat hollow interior as shown in FIG. Further, the joint 9 at both ends thereof
As shown in FIG. 3, a bulge 11 is formed at a position aligned with the . A communication hole is bored in this bulge 11 so that the respective elements 1 communicate with each other at both ends. As shown in FIG. 2, this element 1 is constructed by stacking a pair of metal plates whose entire circumferences are slightly raised in opposite directions. The inner and outer surfaces of this metal plate are each coated with a brazing material. Further, an inner fin 8 is installed inside the element 1. And each element 1
, 1, a fin 2 is interposed between the outer surfaces of the fins 2 as shown in FIG. The folded and bent portion of this fin 2 is the element 1.
contact the outer surface of the In this way, a large number of parts are stacked on top of each other, and the whole is inserted into a high-temperature furnace to melt the brazing filler metal 13 clad on the surface of at least one part. Next, by cooling them, the respective contact parts are integrally brazed and fixed to complete the heat exchanger. The heat exchanger thus formed as shown in FIGS. 3 and 4 is fixed to a vehicle such as a motorcycle via the externally projecting part 5 and the bent part 10. Further, a pipe or a hose is connected to the joint 9. Then, a heat exchange medium flows into one end of each element 1 from one joint 9,
It flows through each element 1 and flows out from the other joint 9. Further, an air flow flows through the outer surface of the element 1 and the fins 2, and heat exchange is performed between the air flow and the heat exchange medium inside the element 1.

Next, FIG. 5 shows a method of brazing the externally protruding parts 5 of another heat exchanger. In this embodiment, the fins 2 are in direct contact with the inner surface of the plate 4, and the contact portion is fixed by brazing. At the same time, an external protruding part 5 is provided on the outer surface side of the plate 4.
It is fixed by brazing. In this embodiment as well, similarly to the previous embodiment, the hole of the external protruding part 5 is fitted into the tubular protrusion 6, and the tip thereof is caulked to form the caulked part 12. As a result, after the two parts are closely fixed, the parts are inserted into a furnace, the brazing material previously coated on the surface of the part is melted, and the two parts are integrally brazed and fixed.

[0009]

According to the brazing method of the present invention, a cylindrical protrusion 6 is integrally formed on the outer surface of the plate 4 disposed in contact with the outside of the core 3, and an externally protruding part 5 is attached to the cylindrical protrusion 6. A step is taken in which the externally protruding part 5 is supported by the plate 4 by fitting the externally protruding part 5 into the hole 7 and caulking the tip of the cylindrical protruding part 6 in this state. Since the brazing process is performed after this process, it is easy to work, and the brazing material 13 provided on the surface of one of the parts is melted while the externally protruding part 5 and the plate 4 are brought into close contact with each other. The contact parts can be fixed by brazing. Therefore, the reliability of brazing is improved. At the same time, unlike in the case of positioning and fixing using conventional rivets, the rivet ends do not protrude inside the plate and create deformed parts or gaps between the plate and other parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts showing a preparation stage of the brazing method of the present invention.

FIG. 1a is a longitudinal cross-sectional view of a main part showing a second preparation stage of the same as above.

FIG. 1b is an explanatory longitudinal cross-sectional view showing the third preparation stage of the above.

2 is a longitudinal cross-sectional view of the externally protruding component 5 fixed by brazing according to the present method, and is a cross-sectional view taken along the line A-A in FIG. 4;

FIG. 3 is a front view of a heat exchanger manufactured by the same method.

FIG. 4 is a plan view of the heat exchanger.

FIG. 5 is an explanatory diagram of a method of brazing externally protruding parts of another heat exchanger.

FIG. 6 is an explanatory diagram of main parts of a conventional method for fixing an externally protruding component.

[Explanation of symbols]

1 Element 2 Fin 3 Core 4 Plate 5 External protruding parts 6 Sill-shaped protrusion 7 holes 8 Inner fin 9 Joint 10　Bending part 11 Bulging part 12　Caulking part 13 Brazing filler metal 14 Wax fillet 15 Rivet 16 Bolt insertion hole

Claims (1)

[Claims] 1. Assemble a core (3) by bringing fins (2) into contact with the outer surface of an elongated hollow element (1) such as a tube through which a heat exchange medium flows;
), and a metal plate (4) is placed in contact with the end face of the plate (4), and an externally protruding part (5) such as a bracket is placed on the outer surface of the plate (4).
are arranged in contact with each other, and at least one of the heat exchange parts in contact with each other has a brazing material placed on the outer surface in advance, or a brazing foil is interposed between both contact parts,
The contact portions are brazed and fixed to each other by a brazing process in which the whole is inserted into and removed from a high-temperature furnace, and the externally protruding parts (
Step 5) of integrally forming a tubular protrusion (6) with a small diameter higher than the plate pressure of the part by burring, and then a hole formed in the flat part of the external protrusion part (5). (7) is fitted into the tubular protrusion (6), and in this state, the tip of the tubular protrusion (6) is caulked to support the external protrusion part (5) on the plate (4). A method for brazing externally protruding parts for a heat exchanger, characterized in that the following steps are performed as a pre-step of the brazing step.